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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// and the DNA geometry given in the Geom_DNA example 
// shall cite the following Geant4-DNA collaboration publications:
// [1] NIM B 298 (2013) 47-54
// [2] Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//
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/// \file PrimaryGeneratorAction.cc
/// \brief Implementation of the PrimaryGeneratorAction class

#include "PrimaryGeneratorAction.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction()
    : G4VUserPrimaryGeneratorAction(), fpParticleGun(0)
{
  G4int n_particle = 1;
  fpParticleGun = new G4ParticleGun(n_particle);

  // default gun parameters
  fpParticleGun->SetParticleEnergy(1. * keV);
  fpParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));

}

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PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  delete fpParticleGun;
}

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void
PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4double x0, y0, z0;

  x0 = ((16.0 * G4UniformRand())-8.0)*micrometer;
  y0 = ((8.0 * G4UniformRand())-4.0)*micrometer;
  z0 = -2.99 * micrometer;
  fpParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
  fpParticleGun->GeneratePrimaryVertex(anEvent);
}
